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-   -   New Portable Radio for Digital Satellite (http://www.homecinemabanter.com/showthread.php?t=35056)

DAB sounds worse than FM August 4th 05 02:07 AM

New Portable Radio for Digital Satellite
 
From www.digitalradiotech.co.uk (there's a picture of it on there)

Sky Gnome - New Portable Radio for Satellite

Sky have announced that they're launching a new portable radio in
October which will allow users to listen to the 80+ digital radio
stations available on digital satellite.

The Sky Gnome is compatible with all Sky digiboxes and has a range of 30
metres. It is not clear yet whether it will only be available for Sky
subscribers or whether anybody with a Sky digibox will be able to
purchase one.

Customers with Sky+ will also be able to listen to radio shows recorded
in their Sky+ planner.

As well as there being far more radio stations available on digital
satellite than on DAB the audio quality of the radio stations on
satellite is significantly higher than on DAB due to the bit rates used
by DAB stations being far too low.

A list of the radio stations available on digital satellite and the bit
rates they use can be found in the table at the bottom of this page.



--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



spiney August 4th 05 01:37 PM

I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).

If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.

Not brilliant, because whatever DAB's drawbacks, it really is portable,
and also has local radio (Sky doesn't).


John Russell August 4th 05 01:55 PM


"spiney" wrote in message
ups.com...
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).

If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.

Not brilliant, because whatever DAB's drawbacks, it really is portable,
and also has local radio (Sky doesn't).


If it is an "audio sender/reciever" then it dosn't sound like you watch a
SKY TV channel whilst someone else is listening to a Sky radio channel in
another room.



Mark Carver August 4th 05 02:03 PM

spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).

If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.


You can happily stuff a SPDIF digital audio signal through an 'analogue' video
sender, and therefore have a 'digital' transmission path, perhaps Sky are
thinking along these lines ?

--
Mark
Please replace invalid and invalid with gmx and net to reply.

Angus Rae August 4th 05 02:29 PM

spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).


What, you mean that XM Radio (http://www.xmradio.com/learn/) and in
particular the Delphi XM MyFi (http://www.xmradio.com/myfi/) can't
exist? Bit of a shame that.

--
Angus G Rae Science & Engineering Support Team
University of Edinburgh
The above opinions are mine, and Edinburgh University can't have them

spiney August 4th 05 03:02 PM

Fair enough, and there's also Worldspace in Europe (not to mention
digital shortwave broadcasting), I was really thinking ot "the usual"
Ku band stuff!

You could have a genuine Ku band portable, by using a "dielectric" sat
antenna, but would still be very "klunky", not pocket size!

Anyone tried Lidl's "satellite tv in a suitcase"?


DAB sounds worse than FM August 4th 05 03:02 PM

spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).



Read what the thread title says:

"New portable radio FOR digital satellite"

not

"New portable digital satellite radio receiver"


If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work,



I'd imagine it'll be Wi-Fi.


but not enough info
is given to make this clear.



Try and actually read what I wrote. I did say it has a range of 30m. How
many satellites are orbiting earth 30 m away?


Not brilliant, because whatever DAB's drawbacks, it really is
portable, and also has local radio (Sky doesn't).



Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



spiney August 4th 05 03:09 PM

er, i personally think above thread a bit pedantic, Sky are "trying" to
claim a portable radio receiver!

Also, quite a few of the 8ish odd Sky radio channels are religious
ranting rubbish!


spiney August 4th 05 03:11 PM

sorry, obvious typo, that should be "80ish Sky radio channels"!


Richard L August 4th 05 03:22 PM

In message .com
"spiney" wrote:

Anyone tried Lidl's "satellite tv in a suitcase"?


If you mean the plastic dish in the carry-case, it works very well and
will give you R2, R4 and World Service over most of Western Europe,
plus much else. On the other hand, the receiver which came with mine
failed after about 18 months because a great many of the little
electrolytic capacitors had popped. But I wasn't too disheartened
because the user interface was so user-unfriendly. There are other
DVB-s receivers capable of working on a 12V DC supply and at least one
of them is much smaller and lighter.

--
Richard L.

Phil Cook August 4th 05 03:29 PM

DAB sounds worse than FM wrote:

Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.


Unles the station you want is only on DAB :-/

--
Phil Cook looking north over the park to the "Westminster Gasworks"

DAB sounds worse than FM August 4th 05 03:41 PM

spiney wrote:
Fair enough, and there's also Worldspace in Europe (not to mention
digital shortwave broadcasting),



What has digital shortwave got to do with satellites?



--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



DAB sounds worse than FM August 4th 05 03:48 PM

spiney wrote:
er, i personally think above thread a bit pedantic, Sky are "trying"
to claim a portable radio receiver!



Call it what you want, but it does function like a portable radio, so I
don't see what your problem is?


Also, quite a few of the 8ish odd Sky radio channels are religious
ranting rubbish!



There's about 85 stations on digital satellite (they're free-to-air,
apart from Talksport), and they include all the main digital radio
"brands", and most stations are at a higher audio quality than on DAB
and none are at a lower audio quality than on DAB.

Compare what's available on the different platforms and what bit rates
they use he

http://www.digitalradiotech.co.uk/in...bit_rate_table

(note that not all the stations listed for DAB are available in any
given location, because some are local stations)


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



DAB sounds worse than FM August 4th 05 03:49 PM

Phil Cook wrote:
DAB sounds worse than FM wrote:

Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.


Unles the station you want is only on DAB :-/



Such as? If you want a local station then surely you can receive it on
FM?


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



Adrian August 4th 05 05:53 PM

Phil Cook wrote:
DAB sounds worse than FM wrote:

Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.


Unles the station you want is only on DAB :-/


Are there any staions that are *only* on DAB?
--
Adrian A



Ad C August 4th 05 07:44 PM

In article . com,
says...
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).

If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.

Not brilliant, because whatever DAB's drawbacks, it really is portable,
and also has local radio (Sky doesn't).


DAB have local radio? It have not got it here. As for portable use, the
DAB signal is so bad, I doubt a portable would wok in a lot of places.
but you are right ab out a Sat radio, it would need a dish.

Stick with FM, it is the best system for portable use and sopunds better
than DAb or other digital radio

DAB sounds worse than FM August 4th 05 07:46 PM

Mike Henry wrote:
In , "Adrian"
wrote:

Phil Cook wrote:
Unles the station you want is only on DAB :-/


Are there any staions that are *only* on DAB?


According to the list on the digitalradiotech website, just 3: DNN,
Passion, Saga. Never heard of them, and I'm sure they won't be missed.



They're all local or regional stations as well, so they're not even
available everywhere.

You did miss one out: Life. I doubt many would lose sleep over not
having that though.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



Ad C August 4th 05 07:46 PM

In article ,
ity says...
spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).



Read what the thread title says:

"New portable radio FOR digital satellite"

not

"New portable digital satellite radio receiver"


If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work,



I'd imagine it'll be Wi-Fi.


but not enough info
is given to make this clear.



Try and actually read what I wrote. I did say it has a range of 30m. How
many satellites are orbiting earth 30 m away?


Not brilliant, because whatever DAB's drawbacks, it really is
portable, and also has local radio (Sky doesn't).



Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.



FM wipes the floor of them both.

Phil Cook August 4th 05 08:04 PM

Ad C wrote:

Satellite wipes the floor with DAB.


FM wipes the floor of them both.


In theory. Come to the rougher bits of London or Birmingham and you
will get fzzz tzzz kssskz from pirates ruining your reception.
--
Phil Cook looking north over the park to the "Westminster Gasworks"

DAB sounds worse than FM August 4th 05 08:52 PM

Ad C wrote:
In article ,
ity says...
spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).



Read what the thread title says:

"New portable radio FOR digital satellite"

not

"New portable digital satellite radio receiver"


If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work,



I'd imagine it'll be Wi-Fi.


but not enough info
is given to make this clear.



Try and actually read what I wrote. I did say it has a range of 30m.
How many satellites are orbiting earth 30 m away?


Not brilliant, because whatever DAB's drawbacks, it really is
portable, and also has local radio (Sky doesn't).



Satellite:
Good audio quality on most stations
80+ radio stations

DAB:

Low audio quality
an average listener will receive 35 stations

Conclusion:

Satellite wipes the floor with DAB.



FM wipes the floor of them both.



Agreed.


--
Steve -
www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



DAB sounds worse than FM August 4th 05 09:01 PM

Phil Cook wrote:
Ad C wrote:

Satellite wipes the floor with DAB.


FM wipes the floor of them both.


In theory. Come to the rougher bits of London or Birmingham and you
will get fzzz tzzz kssskz from pirates ruining your reception.



That's unfortunate, but that only applies to a small fraction of the
population and it certainly does not excuse the fact that the audio
quality on DAB has been degraded to a level that is significantly lower
than FM with good reception. Remember that a large majority of people (I
can't prove that, so don't ask me to, but I'm very confident that I'm
right) get pretty good FM, so why should they have their audio quality
degraded just for the sake of future profits for the commercial radio
groups and to allow the BBC a better chance of renewing their Charter?


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



etillet August 5th 05 10:45 AM

spiney wrote:
I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).

If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.


It seems fairly obvious.


Not brilliant, because whatever DAB's drawbacks, it really is portable,
and also has local radio (Sky doesn't).


There's no local radio on DAB in my locality.

There is local radio on satellite in my locality.

etillet August 5th 05 10:46 AM

Kristoff Bonne wrote:
Gegroet,

spiney schreef:

I've looked at the above links, but sorry, you can't have a portable
digital satellite radio receiver (because it would require its own
satellite dish!).
If it's some sort of portable rf link back to a digibox ("battery
powered videosender"), then ok, that would work, but not enough info is
given to make this clear.



Does it offer some kind of "return-channel" so that you can "control"
the receiver from the kitchen/garden/...?

E.g. can you switch to another radio-station or start or shut down the
receiver at a distance?


Assuming it has a line-out socket it will be quite useful to get stereo
sound on a remote TV connected to the sky box via RF....

Mark Carver August 5th 05 12:48 PM

spiney wrote:

Not brilliant, because whatever DAB's drawbacks, it really is portable,
and also has local radio (Sky doesn't).


Unless you include most of London's local stations, plus a few large regional
commercial stations, and (if you define them as such) the BBC's five 'Celtic'
radio services, Wales, Cymru, Scotland, Nan Gaidheal, and Ulster.

--
Mark
Please replace invalid and invalid with gmx and net to reply.

spiney August 5th 05 01:52 PM

Just to pick up on a few things (above) ......

DAB has local stations, depending on where you are, admittedly usually
just independent ones, not BBC local.

XM and Worldspace exist, but are mainly or wholly subscription, and
more like terrestrial networks in coverage (you can't "point at" a
particular satellite). I mentioned shortwave DRM because it's also
quite similar in concept.

I think the Sky description of "digital radio" is extremely misleading,
seeing as it's only a wireless loudspeaker link to an existing digibox,
and the wording is deliberately phrased so as to disguise this (eg,
"compatible with"!).

I also find fm pirate radio highly annoying, eg when trying to listen
to R4 on Walkman, particularly since they often come up right next to
it, with much too big power/deviation, sometimes making the legit
stations unreceivable.
It's quite remarkable that you can be sent to prison for not having a
tv license, yet these pirate stations seem immune to any official
sanctions!


DAB sounds worse than FM August 5th 05 03:32 PM

spiney wrote:
Just to pick up on a few things (above) ......

DAB has local stations, depending on where you are, admittedly usually
just independent ones, not BBC local.

XM and Worldspace exist, but are mainly or wholly subscription, and
more like terrestrial networks in coverage (you can't "point at" a
particular satellite).



You're going to struggle picking up XM because it covers the US, not the
UK.


I mentioned shortwave DRM because it's also
quite similar in concept.



It's not transmitted from satellites.


I think the Sky description of "digital radio" is extremely
misleading,



The Sky Gnome allows you to receive digital radio, so what's the
problem?


seeing as it's only a wireless loudspeaker link to an
existing digibox, and the wording is deliberately phrased so as to
disguise this (eg, "compatible with"!).



I bet you're one of these people that object to radio being delivered
via the internet being called radio, and TV delivered via broadband
being called TV?


I also find fm pirate radio highly annoying, eg when trying to listen
to R4 on Walkman, particularly since they often come up right next to
it, with much too big power/deviation, sometimes making the legit
stations unreceivable.



That's unfortunate. But that doesn't justify them degrading the audio
quality on DAB to sub-FM levels.




--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



spiney August 5th 05 03:55 PM

to above poster (DAB sounds worse ...).

I never said XM was available outside USA.

Similarly, worldspace is European/Africa only, although with some
regional variations in this case.

DRM is shortwave, which i also said above (!).

The point being that all these systems are similar in type of coverage,
and require subscription.

3Ghz is received on portable radios, but only having tiny antennae, so
the channel capacity is much reduced, there are far fewer stations
(remember, Ku band carries tv and radio simultaneously!).

On the other hand, Ku band sat radio is directional, giving much more
choice, and many of the stations are unencrypted.

I've said what my problem with the Gnome is.

Why on earth would i object to people getting broadcast channels via
the Internet?

You don't like DAB? OK, then, just don't use it.


DAB sounds worse than FM August 5th 05 04:18 PM

spiney wrote:
to above poster (DAB sounds worse ...).

I never said XM was available outside USA.

Similarly, worldspace is European/Africa only, although with some
regional variations in this case.



Plus Asia.


DRM is shortwave, which i also said above (!).




But what has that got to do with satellite?


The point being that all these systems are similar in type of
coverage, and require subscription.



So?


3Ghz is received on portable radios, but only having tiny antennae, so
the channel capacity is much reduced,



The channel capacity is lower on the radio systems because they use a
narrower bandwidth. Not because they use tiny antennas (at 3 GHz a
half-wave dipole is only 5 cm long).


there are far fewer stations
(remember, Ku band carries tv and radio simultaneously!).



Yeah, and the bandwidth used is enormous.


On the other hand, Ku band sat radio is directional,



All satellite transmissions are directional because they're transmitted
from a dish, and dishes are inherently directional.


giving much more
choice, and many of the stations are unencrypted.

I've said what my problem with the Gnome is.



But what *is* your problem with the Gnome?


Why on earth would i object to people getting broadcast channels via
the Internet?



Some do object, and given that you object to a receiver of digital radio
being called a digital radio then I thought you'd object to that too.


You don't like DAB? OK, then, just don't use it.



I don't, apart from occasionally listening to check what it sounds like,
and it always sounds utterly ****e.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



spiney August 5th 05 04:34 PM

I can't reply in full to all these rather pedantic quibbles, however
......

Worldstar covers part of Asia, not all of it.

All satellite is not directional, XM isn't for instance.

The way Gnome is advertised is misleading, that's all. Otherwise, I'm
sure it's just what some people want. FIne.

A smaller antenna is inherently worse, as SNR is lower, therefore
channel capacity is reduced, regardeless of other factors (see
Shannon's formula).


DAB sounds worse than FM August 5th 05 04:57 PM

spiney wrote:
I can't reply in full to all these rather pedantic quibbles, however
.....

Worldstar covers part of Asia, not all of it.



What were you saying about pedantic quibbles?


All satellite is not directional, XM isn't for instance.



The XM signal WILL BE transmitted from a dish on the spacecraft, and
dishes are ALL directional, therefore XM's signal is directional.


The way Gnome is advertised is misleading, that's all. Otherwise, I'm
sure it's just what some people want. FIne.

A smaller antenna is inherently worse, as SNR is lower, therefore
channel capacity is reduced, regardeless of other factors (see
Shannon's formula).



That's nonsense though, because the field strength for XM is far, far
higher than the field strength for DVB-S signals. And:

C = B log2 (1 + SNR)

C = capacity, B = bandwidth.

Therefore, capacity is directly proportional to bandwidth, but weakly
dependent on SNR.

Basically, the spectral efficiency in bits/s/Hz (capacity / bandwidth)
isn't much different for XM and DVB-S, and it's the bandwidth that is by
far the main reason why DVB-S has such a massive capacity compared to
XM.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



spiney August 5th 05 05:26 PM

All radio waves are directional, yes, I agree.

But a Ku dish antenna has to be pointed accurately (you may have
noticed), 3GHz ones like xm don't. that's the point of it (although,
you certainly could use a fixed aerial for better reception).

Whether you can decode a digital signal depends directly on received
SNR, which depends on antenna aperture. A dish is much better in that
respect.

Weakly dependent on snr??? Not from the actual formula, which you've
given!

Yes, ok, a higher field strength will give better reception.

Anything else? How about my punctuation? Phraseology? There must be
something!


:::Jerry:::: August 5th 05 05:37 PM


"spiney" wrote in message
ups.com...
snip
[ pirate radio stations ]

It's quite remarkable that you can be sent to prison for not having

a
tv license, yet these pirate stations seem immune to any official
sanctions!


There are sanctions but the problem is tracing the pirate radio
station, and then possibly tracing the people behind it (I suspect
many such pirate stations have a broader agenda than just playing
music IYSWIM...), all the TVLA people have to do is turn up at any
address without a licence.



DAB sounds worse than FM August 5th 05 05:50 PM

spiney wrote:
All radio waves are directional, yes, I agree.



That is not what I meant. Directional wrt antennas means that signals
are more concentrated in some directions rather than others. All dishes
transmit directional signals.


But a Ku dish antenna has to be pointed accurately (you may have
noticed), 3GHz ones like xm don't. that's the point of it (although,
you certainly could use a fixed aerial for better reception).



No, that's not the point at all, because the XM satellite uses higher
transmission powers to offset the lower antenna gain due to not having a
directional dish antenna at the receiver.


Whether you can decode a digital signal depends directly on received
SNR, which depends on antenna aperture. A dish is much better in that
respect.



A dish isn't very good for reception in your car, though.


Weakly dependent on snr??? Not from the actual formula, which you've
given!



Wrong. I will demonstrate:

C = B log2 (1 + SNR)

C is directly proportional to B

Changing SNR by a factor of 1 million (60 dB) changes C by (ignoring the
1 in the equation):

log2 (1,000,000) = 19.9

Therefore, C is weakly dependent on SNR.

QED.


Yes, ok, a higher field strength will give better reception.



Not necessariily. If the field strength is adequate to give a BER (bit
error rate) of effectively zero, then higher field strength will not
give better reception, because it is already effectively perfect.


Anything else? How about my punctuation? Phraseology? There must be
something!



No, that is all.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview, DAB & MP3 Player Prices:
http://www.digitalradiotech.co.uk/fr..._receivers.htm
http://www.digitalradiotech.co.uk/da...tal_radios.htm
http://www.digitalradiotech.co.uk/mp...rs_1GB-5GB.htm
http://www.digitalradiotech.co.uk/mp...e_capacity.htm



Prometheus August 5th 05 08:37 PM

In article , DAB sounds worse
than FM writes
spiney wrote:

----------Cut----------

I think the Sky description of "digital radio" is extremely
misleading,



The Sky Gnome allows you to receive digital radio, so what's the
problem?


It's wireless speakers or headphones, I can plug my 863MHz base in to a
DVB-T box but it does not make it a digital radio.

seeing as it's only a wireless loudspeaker link to an
existing digibox, and the wording is deliberately phrased so as to
disguise this (eg, "compatible with"!).



I bet you're one of these people that object to radio being delivered
via the internet being called radio, and TV delivered via broadband
being called TV?


TV delivered by broadband is still television, as is CCTV, CATV, SSTV
over POTS.

I also find fm pirate radio highly annoying, eg when trying to listen
to R4 on Walkman, particularly since they often come up right next to
it, with much too big power/deviation, sometimes making the legit
stations unreceivable.


One reason for using DAB in a metropolis.

That's unfortunate. But that doesn't justify them degrading the audio
quality on DAB to sub-FM levels.


Nothing does

--
Ian G8ILZ

Max Demian August 5th 05 11:43 PM

"DAB sounds worse than FM" wrote in message
...

I bet you're one of these people that object to radio being delivered via
the internet being called radio, and TV delivered via broadband being
called TV?


Or a radio controlled clock a 'clock'.

--
Max Demian



hwh August 6th 05 12:37 AM


"Kristoff Bonne" schreef in bericht
...
Gegroet,


Max Demian schreef:
I bet you're one of these people that object to radio being delivered via
the internet being called radio, and TV delivered via broadband being
called TV?


Or a radio controlled clock a 'clock'.


Well, some of them are marketed as an "atomic clock". Is this correct?


It has atoms if it exists :-)

gr, hwh



Prometheus August 6th 05 12:40 AM

In article , Kristoff Bonne
writes
Gegroet,


Max Demian schreef:
I bet you're one of these people that object to radio being delivered
via the internet being called radio, and TV delivered via broadband
being called TV?


Or a radio controlled clock a 'clock'.


Well, some of them are marketed as an "atomic clock". Is this correct?


Arguably they all depend on properties of atoms.

--
Ian G8ILZ

seani August 6th 05 01:40 AM

On Sat, 06 Aug 2005 00:37:56 +0200, hwh wrote:


"Kristoff Bonne" schreef in bericht
...
Gegroet,


Max Demian schreef:
I bet you're one of these people that object to radio being delivered via
the internet being called radio, and TV delivered via broadband being
called TV?


Or a radio controlled clock a 'clock'.


Well, some of them are marketed as an "atomic clock". Is this correct?


It has atoms if it exists :-)

gr, hwh


What a load of old photons.


JC August 6th 05 02:15 AM

On Thu, 04 Aug 2005 19:04:01 +0100, Phil Cook
wrote:

FM wipes the floor of them both.


In theory. Come to the rougher bits of London or Birmingham and you
will get fzzz tzzz kssskz from pirates ruining your reception.


Yes but on FM you get the pirates, many of which have better sound
quality and more interesting programming than the so called
professionals.

One of the great tragedies of DAB is that there hasn't been provision
for public access or small scale local broadcasting. I wonder if some
of my favorite local stations such as Delta or Radio Jackie will ever
be available on DAB.

I also wonder why the broadcasters feel the need to simulcast the
large scale FM stations on DAB. Radios 1-4, Capital, Kiss etc are all
duplicated on DAB in London when they're available in better quality
and over a larger area on FM. We abandoned AM/FM simulcasting in the
80's, why start again?

Rgds
Jonathan


tony sayer August 6th 05 11:26 AM

In article , JC
writes
On Thu, 04 Aug 2005 19:04:01 +0100, Phil Cook
wrote:

FM wipes the floor of them both.


In theory. Come to the rougher bits of London or Birmingham and you
will get fzzz tzzz kssskz from pirates ruining your reception.


Yes but on FM you get the pirates, many of which have better sound
quality and more interesting programming than the so called
professionals.


Funny that, but didn't commercial radio in the UK get started due to
some pirate broadcasters?.

Trouble is that once they go light like Kiss FM and choice et al they
soon loose their roots very rapidly;(.....

One of the great tragedies of DAB is that there hasn't been provision
for public access or small scale local broadcasting. I wonder if some
of my favorite local stations such as Delta or Radio Jackie will ever
be available on DAB.


Very much doubt it. I know the lads at radio Jackie and how much it
costs to go on a DAB MUX and I can't see just how they could afford it
even at 64 K mono...


I also wonder why the broadcasters feel the need to simulcast the
large scale FM stations on DAB. Radios 1-4, Capital, Kiss etc are all
duplicated on DAB in London when they're available in better quality
and over a larger area on FM. We abandoned AM/FM simulcasting in the
80's, why start again?


Ask OFCOM who will do a consultation for you!.

--
Tony Sayer



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